I would like to capture this exception (the "Unexpected Exception") do something and then in the validator (in the action) setup the errors with addFieldError from the ActionSupport class,

Thanks for the help :)

EDIT:

The dto class:

public class SomeDto() {

private Integer intCol; //{with getters&setters}

The problem is that when the user clear the input in the Form (in the jsp), struts try to convert [''] (or String empty in others words) to an Integer with the ParametersInterceptor class (like in the log line up).